The Claude Code Leak: What Anthropic Accidentally Revealed About the Future of AI

A source map in an npm package exposed 512,000 lines of TypeScript. What's inside is the first public blueprint of a production AI agent - and the gap between what's shipped and what's built is staggering. On March 31, 2026, Anthropic made a mistake that quietly exposed something much bigger than intended. A routine npm release of Claude Code included a source map file - cli.js.map. Source maps are debugging tools that map compressed production code back to its original, human-readable source.